Lymphocytes Percentage (Lymphocytes %)
Haematology marker
Lymphocytes Percentage
Lymphocytes Percentage (Lymphocytes %)
The proportion of white blood cells that are lymphocytes, expressed as a percentage of the total. This relative differential value is distinct from the absolute lymphocyte count and shifts with changes in any other white-cell line, so it should be interpreted alongside the absolute count.
PED Notes
A relative value best read with the absolute lymphocyte count. In athletes, a low lymphocyte percentage can accompany the acute post-exercise state or, if persistent alongside a low absolute count, may signal overtraining, severe contest-prep caloric deficit, or chronic stress. A high percentage is most often a relative rise during viral infection. Not directly changed by AAS.
When high
When high (>45%):
- Commonly a relative increase during viral infection (EBV, CMV, influenza) or simply a reflection of a low neutrophil percentage
- Confirm with the absolute lymphocyte count; a transient rise with viral illness is expected and self-limiting
- Persistent, unexplained lymphocytosis on the absolute count warrants further evaluation
When low
When low (<20%):
- Often a relative change, but a genuinely low absolute lymphocyte count (lymphopenia) is meaningful. In athletes the usual drivers are overtraining, severe caloric deficit during contest prep, chronic psychological stress, and high-dose corticosteroids
- Check the absolute count and follow the lymphopenia guidance under the absolute Lymphocytes marker if it is truly low
Supportive measures:
- Reduce training volume if overtraining is suspected (the most common cause in athletes)
- Increase caloric intake if in severe deficit; improve sleep (7-9h)
- Consider zinc 30mg/day, vitamin D3 5000 IU/day, and glutamine 5-10g/day to support immune-cell function; rule out viral infection if persistent
History Chart
Reading History
Frequently Asked Questions
Reference Ranges
Standard Range